A couple of these are on my pet peeve list; I bet you find a couple that are on yours as well. Enjoy The Oatmeal's humorous look at some of the most common (and annoying) spelling mistakes!
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I'm surprised how often native speakers commit these kind of spelling mistakes, while people who learned Engish as second language don't.
reign vs rein
--especially that new kind of monarchy, "free reign"
pedal vs peddle
-- you don't peddle a bike unless you're selling
and one I spotted last week: using segway to mean segue!
A more proper response to the problem, true to the examples listed, would be to upgrade spell check programs so that they automatically correct grammar as well.
You don't take steps to insure something doesn't happen unless you're paying for an indemnity.
You /ensure/ it isn't going to get broken because you don't want to pay to insure it.